Definition
/**
* Close a cursor.
*
* Example: close_cursor('my_cursor')
* Produces: CLOSE my_cursor
*
* Example: close_cursor() - closes all cursors
* Produces: CLOSE ALL
*
* @param null|string $cursorName Cursor to close, or null to close all
*/
close_cursor(?string $cursorName) : CloseCursorFinalStep